Feature/pdp fetch priority

[gabridevs]

What problem is this solving?

This change improves page performance by ensuring the main product image is prioritized during loading. By setting the fetchpriority: 'high' for the first product image, we ensure that the most important image (usually the first one) is loaded first, enhancing user experience, especially for pages with multiple images.

How to test it?

You can test this change by visiting the following workspace where the branch is linked. Check the loading behavior of the first product image, ensuring it is loaded before others when opening a product page.

[Workspace](Link goes here!)

Screenshots or example usage:

Describe alternatives you've considered, if any.

No alternatives considered as fetchpriority: 'high' is a straightforward and effective solution for this problem.

[vtex-io-ci-cd]

Hi! I'm VTEX IO CI/CD Bot and I'll be helping you to publish your app! 🤖

Please select which version do you want to release:

• Patch (backwards-compatible bug fixes)

• Minor (backwards-compatible functionality)

• Major (incompatible API changes)

And then you just need to merge your PR when you are ready! There is no need to create a release commit/tag.

• No thanks, I would rather do it manually 😞

[gabridevs]

Hi! I'm VTEX IO CI/CD Bot and I'll be helping you to publish your app! 🤖

Please select which version do you want to release:

* [ ]  Patch (backwards-compatible bug fixes)

* [x]  Minor (backwards-compatible functionality)

* [ ]  Major (incompatible API changes)

And then you just need to merge your PR when you are ready! There is no need to create a release commit/tag.

* [ ]  No thanks, I would rather do it manually 😞